var passableOnly = true;

​

    for (var i = 0; i < value.length; i++) {

      var c = value.charAt(i);

      var cc = value.charCodeAt(i);

      codes.push(cc);

      if (passableOnly)

        passableOnly = (c >= '0' && c <= '9') || (c >= 'a' && c <= 'z' || c === '_' || c === '-');

    }

​

    if (passableOnly)

      return 's-' + value;

    else

      return 'n-' + codes.join('-');

  }

​

  export function decodeFromAttributeName(attributeNamePart: string): string {

    if (attributeNamePart.slice(0, 2) === 's-')

      return attributeNamePart.slice(2);

​

    var codes = attributeNamePart.slice(2).split('-');

    var result: string[] = [];

    for (var i = 0; i < codes.length; i++) {

      try {

      }

      catch (error) {

        console.log('Parsing attribute name error: ' + attributeNamePart + ' has non-numeric chunk ' + i + ' (' + codes[i] + ').');

        return null;

      }

    }

    return result.join('');

  }

​

  export function startsWith(str: string, prefix: string) {

    if (!str) return !prefix;

    if (!prefix) return false;

    if (str.length < prefix.length) return false;

    if (str.charCodeAt(0) !== prefix.charCodeAt(0)) return false;

    if (str.slice(0, prefix.length) !== prefix) return false;

    else return true;

  }

​

  export function dateNow(): number {

    if (Date.now)

      return Date.now();

    else

      return new Date().valueOf();

  }

​

  export var objectKeys = (obj: any): string[] => {

    if (typeof Object.keys === 'function')

      objectKeys = Object.keys;

    else

      objectKeys = (obj: any): string[] => {

        var result: string[] = [];

        for (var k in obj) if (obj.hasOwnProperty(k)) {

          result.push(k);

        }